Improvement in devices for centering cylinders



G. F. HAWLEY.

Devices for Centening Cylinders. N0.l52,487, PatentedJ'une30,1874.

[7 j won/@M UNrr) STATES PATENT QFFICE.

GEORGE F. IIANVLEY, CF GRAND RAPIDS, MICHIGAN.

IMPROVEMENT IN DEVCES FOR CENTERING CVLINDERS.

Specification forming part of Letters Patent No. 152,487, dated June 30, 15745 application tiled December 19, 1873.

To all whom 'it may concer-n Be it known that I, GEORGE F. HAWLEY, of the city of Grand Rapids, county ot' Kent and State of Michigan, have invented a new Device for Centering Cylinders.

The following description, taken in connection with the accompanying drawings hereto annexed, forms a tull and exact specification, wherein are set forth the nature and principles of the invention, by means ot' which the same may be distinguished from others ot' a similar class, together with such parts thereof as are claimed as new and a-rc desired to be secured by Letters Patent of the United States.

The nature of my invention consists in a frame provided with three or more adjustable longitudinally, and also provided'with one adjustable revolving, arm turuingin an adjustable hub, so constructed that the whole device may be readily adjusted in a cylinder, and by the revolution of the revolving arm the exact center quickly ascertained. lhe principal object of my invention is to center the cylinder of a steam-engine so that the piston may be quickly and accurately adjusted to a line drawn through the exact center ot' the cylinder, thereby insuring the perfect working of the piston.

In the drawings, Figure l is a perspective view ot` my invention. Fig. 2 is a View of the adjustable hub C with the dial I), and Fig. 3 is an enlarged vieu ot' a portion ot' the frame with the cylinder O and set-screws.

In Fig-l, F represents the frame, Which is provided with tour short slotted arms,- as shown. Fit-ted into these slotted arms are the arms A A1 A2 A3. Each ofthe last-named arms is held in place and adjusted by a set-screw, as shown. In the center of the frame F is a cylinder, O, rigidly attached thereto and provided ivith set-screws S S S, as shown in Fig. 3. Into cylinder O is fitted the hub C, which supports the dial or eircularplate I). The hub C is provided with the groove g, as shown in Fig. 2, which groove is provided to receive the points of the set-screws S S S, and is thereby more rlnly held in place bythe set-screws. 'Ihe arm R is provided With a small pin rigidly attached, which tits into the hole E in the disk or dial I), by `means ot' which it is revolved.

In centering a cylinder my device is used as follows: The frame is placed in the cylinder to be centered, and the arms A, Al, A2, and A are extended until their outer points are pressed against the inner surface ot the cylinder, and are fastened by means ot` the setscrews, thus holding the frame tirmly in place. This brings the point E very near the center ot' the cylinder. By revolving the arm R, it' the point E is out of the center it will be quickly discovered, and the plate of dial I), being firmly attached to the hub C, can be adjusted by means of the set-screws S S S", so that the small hole in the plate Will be the exact center ot' the cylinder, which may be tested by revolving the arm R, as bet'ore described.

I claim- The device for centering cylinders consisting ot the adjustable arms supported by the frame F, in combination with the revolving arm R, turning in the adjustable plate I), all constructed substantially as described.

GEO. F. HAWLEY.

VitneSSes: j

GnAnLns A. RENWICK, EDWARD TAGeAnr. 

